In vain we shall penetrate more and more deeply the secrets of the structure of the human body, we shall not dupe nature; we shall die as usual.

Our sun enlightens the planets that belong to him; why may not every fixed star also have planets to which they give light?

There are three things I have loved but never understood. Art, music and women.

I have lived one hundred years; and I die with the consolation of never having thrown the slightest ridicule upon the smallest virtue.

Mathematicians are like lovers. Grant a mathematician the least principle, and he will draw from it a consequence which you must also grant him, and from this consequence another.

It is beauty that begins to please, and tenderness that completes the cbarm.

Leibniz never married; he had considered it at the age of fifty; but the person he had in mind asked for time to reflect. This gave Leibniz time to reflect, too, and so he never married.